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<blockquote data-quote="beavs2112" data-source="post: 906834" data-attributes="member: 384689"><p>Hi RimaNTSS. I have been following this thread with interest & I think I have an answer to this question. Please refer to Prodelin drawing 4000-031 attached. Prodelin refers to focal length "f" on offset reflectors as the length from the <span style="color: rgb(255, 0, 0)"><strong>FEEDHORN FOCUS POINT </strong><span style="color: rgb(0, 0, 0)">to the start of the curve of the antenna. Not antenna focus point to somewhere.</span></span></p><p><span style="color: rgb(255, 0, 0)"></span></p><p><span style="color: rgb(255, 0, 0)"></span></p><p></p><p>I think that the 39 or 50 is the angle from centerline of feedthroat to angled side of feed (1/2 of opening angle). [ATTACH]70481[/ATTACH]</p><p></p><p>2 x 39 deg = 78 deg. Again it's my theory only. Maybe only Prodelin RF engineers know answer. In practical sense the wider antenna would need a wider angle feed to be properly illuminated.</p></blockquote><p></p>
[QUOTE="beavs2112, post: 906834, member: 384689"] Hi RimaNTSS. I have been following this thread with interest & I think I have an answer to this question. Please refer to Prodelin drawing 4000-031 attached. Prodelin refers to focal length "f" on offset reflectors as the length from the [COLOR=rgb(255, 0, 0)][B]FEEDHORN FOCUS POINT [/B][COLOR=rgb(0, 0, 0)]to the start of the curve of the antenna. Not antenna focus point to somewhere.[/COLOR][/COLOR] [COLOR=rgb(255, 0, 0)] [/COLOR] I think that the 39 or 50 is the angle from centerline of feedthroat to angled side of feed (1/2 of opening angle). [ATTACH]70481[/ATTACH] 2 x 39 deg = 78 deg. Again it's my theory only. Maybe only Prodelin RF engineers know answer. In practical sense the wider antenna would need a wider angle feed to be properly illuminated. [/QUOTE]
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